vim: Fix for CVE-2026-73074

Pick the patch from [1], also referenced in the NVD report [2].

[1] https://github.com/vim/vim/commit/a9336b476fd1a182e3f79b5f83c0ffb04f8a922b
[2] https://nvd.nist.gov/vuln/detail/CVE-2026-73074

(From OE-Core rev: 61f5f1268344dac4696f6390e4a81b6ed324fd34)

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>

meta/recipes-support/vim/files/CVE-2026-73074.patch

@@ -0,0 +1,101 @@
+From a9336b476fd1a182e3f79b5f83c0ffb04f8a922b Mon Sep 17 00:00:00 2001
+From: Yasuhiro Matsumoto <mattn.jp@gmail.com>
+Date: Thu, 23 Jul 2026 20:14:13 +0000
+Subject: [PATCH] patch 9.2.0841: [security]: heap overflow when adding > 65535
+ text properties
+
+Problem:  [security]: heap overflow when adding > 65535 text properties
+          (Wang1rrr).
+Solution: Verify that the number of text properties falls within the
+          limit (Yasuhiro Matsumoto).
+
+Github Security Advisory:
+https://github.com/vim/vim/security/advisories/GHSA-hm4g-pjfx-m27j
+
+Signed-off-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>
+Signed-off-by: Christian Brabandt <cb@256bit.org>
+
+CVE: CVE-2026-73074
+Upstream-Status: Backport [https://github.com/vim/vim/commit/a9336b476fd1a182e3f79b5f83c0ffb04f8a922b]
+Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
+---
+ src/errors.h                  |  4 ++++
+ src/po/vim.pot                |  3 +++
+ src/testdir/test_textprop.vim | 18 ++++++++++++++++++
+ src/textprop.c                |  7 +++++++
+ 4 files changed, 32 insertions(+)
+
+diff --git a/src/errors.h b/src/errors.h
+index 01ed16a035..5354e85f25 100644
+--- a/src/errors.h
++++ b/src/errors.h
+@@ -3795,3 +3795,7 @@ EXTERN char e_socket_server_failed_connecting[]
+ EXTERN char e_socket_server_unavailable[]
+ 	INIT(= N_("E1567: Cannot start socket server, socket path is unavailable"));
+ #endif
++#ifdef FEAT_PROP_POPUP
++EXTERN char e_too_many_text_properties_on_a_single_line[]
++	INIT(= N_("E1580: Too many text properties on a single line"));
++#endif
+diff --git a/src/po/vim.pot b/src/po/vim.pot
+index be79cf0dab..100344e270 100644
+--- a/src/po/vim.pot
++++ b/src/po/vim.pot
+@@ -8838,6 +8838,9 @@ msgstr ""
+ msgid "E1567: Cannot start socket server, socket path is unavailable"
+ msgstr ""
+ 
++msgid "E1580: Too many text properties on a single line"
++msgstr ""
++
+ #. type of cmdline window or 0
+ #. result of cmdline window or 0
+ #. buffer of cmdline window or NULL
+diff --git a/src/testdir/test_textprop.vim b/src/testdir/test_textprop.vim
+index b5c9f63f65..5a69ca75e7 100644
+--- a/src/testdir/test_textprop.vim
++++ b/src/testdir/test_textprop.vim
+@@ -4781,4 +4781,22 @@ func Test_textprop_materialize_list()
+ 	call assert_equal([], prop_list(1, #{ids: 3->range()}))
+ endfunc
+ 
++" Adding more than 65535 text properties to one line must be rejected instead
++" of wrapping the uint16_t property count and overflowing the allocation.
++func Test_prop_add_over_uint16_max()
++  CheckNotAsan
++  CheckNotValgrind
++  new
++  call setline(1, 'x')
++  call prop_type_add('overflow', {})
++  for _ in range(0xffff)
++    call prop_add(1, 1, {'type': 'overflow', 'length': 0})
++  endfor
++  call assert_equal(0xffff, prop_list(1)->len())
++  call assert_fails("call prop_add(1, 1, {'type': 'overflow', 'length': 0})", 'E1580:')
++  call assert_equal(0xffff, prop_list(1)->len())
++  call prop_type_delete('overflow')
++  bwipe!
++endfunc
++
+ " vim: shiftwidth=2 sts=2 expandtab
+diff --git a/src/textprop.c b/src/textprop.c
+index a06605d3dd..1f06615dbc 100644
+--- a/src/textprop.c
++++ b/src/textprop.c
+@@ -240,6 +240,13 @@ prop_add_one(
+ 	proplen = get_text_props(buf, lnum, &props, TRUE);
+ 	textlen = buf->b_ml.ml_line_len - proplen * sizeof(textprop_T);
+ 
++	// prop_count is a uint16_t; stop before proplen + 1 wraps to zero.
++	if (proplen >= 0xffff)
++	{
++	    emsg(_(e_too_many_text_properties_on_a_single_line));
++	    goto theend;
++	}
++
+ 	if (lnum == start_lnum)
+ 	    col = start_col;
+ 	else
+-- 
+2.50.1
+

meta/recipes-support/vim/vim.inc

@@ -52,6 +52,7 @@ SRC_URI = "git://github.com/vim/vim.git;branch=master;protocol=https \
            file://CVE-2026-57456.patch \
            file://CVE-2026-73072.patch \
            file://CVE-2026-73073.patch \
+           file://CVE-2026-73074.patch \
            "
 
 PV .= ".1683"